01 - Bring a large pot of salted water to a boil. Add halved baby potatoes and simmer until fork-tender, 15 to 20 minutes. Drain and let cool slightly.
02 - In a mixing bowl, whisk together sour cream, mayonnaise, Dijon mustard, apple cider vinegar, garlic powder, onion powder, salt, and black pepper until smooth.
03 - Transfer cooled potatoes to a large bowl. Add sliced scallions and most of the chopped chives, reserving a small portion for garnish.
04 - Pour dressing over potatoes and gently toss until all pieces are evenly coated.
05 - Garnish with reserved chives. Serve immediately or refrigerate for at least 1 hour for enhanced flavor.